Better include asbestos underwear too. You put your glutius maximus in danger when you tell some people to mod their systems ;-) But seriously, can't LISTSERV just insert the RSCS origin into the From: field in such cases? It already adds the "Warning -- RSCS tag indicates an origin of <user>@<node>", so it knows roughly where the file came from. With the warning, all the necessary caveats are in place, and the user ought to be suspicious of addresses that aren't what they seem to be. Ross